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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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High-throughput single-cell mechanical phenotyping with real-time deformability cytometry.

Marta Urbanska1, Philipp Rosendahl1, Martin Kräter1

  • 1Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany.

Methods in Cell Biology
|September 1, 2018
PubMed
Summary

Real-time deformability cytometry (RT-DC) offers high-throughput, contactless cell mechanical characterization. This method enables precise analysis of cell populations and their mechanical properties for various biological applications.

Keywords:
Cell mechanicsDeformability cytometryMechanical phenotypingMicrofluidicsSingle cell

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Area of Science:

  • Biophysics
  • Cell Biology
  • Biotechnology

Background:

  • Cell mechanical properties are label-free biomarkers for cell state and function.
  • Alterations in cell mechanics are linked to cancer metastasis, immune cell activation, and stem cell differentiation.
  • High-throughput single-cell mechanical characterization is crucial for advancing mechanical phenotyping.

Purpose of the Study:

  • To provide practical guidance on implementing real-time deformability cytometry (RT-DC).
  • To detail setup, operational principles, and experimental protocols for RT-DC.
  • To discuss sample preparation, potential measurement challenges, data analysis, and method comparison.

Main Methods:

  • Real-time deformability cytometry (RT-DC) utilizes microfluidics for contactless, high-throughput cell analysis.
  • RT-DC processes up to 1000 cells per second, enabling large-scale sample comparison.
  • The technique allows for the determination of the apparent Young's modulus of individual cells.

Main Results:

  • RT-DC facilitates precise characterization of heterogeneous cell populations.
  • The method enables the comparison of large sample numbers efficiently.
  • Practical protocols for diverse sample types (cell cultures, blood, primary cells) are presented.

Conclusions:

  • RT-DC is a powerful tool for label-free cell mechanical phenotyping.
  • The chapter offers comprehensive insights into RT-DC implementation and data analysis.
  • RT-DC's performance is discussed in comparison to alternative single-cell mechanical characterization techniques.